One large 12-week study found that a daily garlic supplement reduced the number of colds by 63% compared with placebo (4).
The average length of cold symptoms was also reduced by 70%, from 5 days in placebo to just 1.5 days in the garlic group.
Another study found that a high dose of garlic extract (2.56 grams per day) can reduce the number of days sick with cold or flu by 61% (5).
https://www.ncbi.nlm.nih.gov/pubmed/11697022https://www.ncbi.nlm.nih.gov/pubmed/22280901
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